65 is an odd composite number composed of two prime numbers multiplied together.

What does the number 65 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

65 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 65:

5 × 13

See below for interesting mathematical facts about the number 65 from the Numbermatics database.

Names of 65

  • Cardinal: 65 can be written as Sixty-five.

Scientific notation

  • Scientific notation: 6.5 × 101

Factors of 65

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 18

Divisors of 65

  • Number of divisors d(n): 4
  • Complete list of divisors:
    1 5 13 65
  • Sum of all divisors σ(n): 84
  • Sum of proper divisors (its aliquot sum) s(n): 19
  • 65 is a deficient number, because the sum of its proper divisors (19) is less than itself. Its deficiency is 46

Bases of 65

  • Binary: 10000012
  • Hexadecimal: 0x41
  • Base-36: 1T

Squares and roots of 65

  • 65 squared (652) is 4225
  • 65 cubed (653) is 274625
  • The square root of 65 is 8.0622577483
  • The cube root of 65 is 4.0207257585

Scales and comparisons

How big is 65?
  • 65 seconds is equal to 1 minute, 5 seconds.
  • To count from 1 to 65 would take you about thirty-two seconds.

    This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

  • A cube with a volume of 65 cubic inches would be around 0.3 feet tall.

Recreational maths with 65

  • 65 backwards is 56
  • The number of decimal digits it has is: 2
  • The sum of 65's digits is 11
  • More coming soon!

Copy this link to share with anyone:

Share this page on social media:

Link to this page

HTML: To link to this page, just copy and paste the link below into your blog, web page or email.

BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:

Cite this page

MLA style:
"Number 65 - Facts about the integer". Numbermatics.com. 2024. Web. 18 April 2024.

APA style:
Numbermatics. (2024). Number 65 - Facts about the integer. Retrieved 18 April 2024, from https://numbermatics.com/n/65/

Chicago style:
Numbermatics. 2024. "Number 65 - Facts about the integer". https://numbermatics.com/n/65/

The information we have on file for 65 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

Keywords: Divisors of 65, math, Factors of 65, curriculum, school, college, exams, university, Prime factorization of 65, STEM, science, technology, engineering, physics, economics, calculator, sixty-five.

Oh no. Javascript is switched off in your browser.
Some bits of this website may not work unless you switch it on.